Design a URL shortening service similar to TinyURL or Bit.ly. **Functional Requirements:** - Given a long URL, generate a unique short URL - When users access the short URL, redirect them to the original long URL - Users can optionally set custom short links - Links should expire after a configurable time period **Non-Functional Requirements:** - The system should be highly available - URL redirection should happen in real-time with minimal latency - Shortened links should not be predictable **Scale:** - 100M new URLs per month - 10:1 read to write ratio (1B redirections per month)

URL Shortener Design

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Design a URL shortening service similar to TinyURL or Bit.ly.

Functional Requirements

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Non-Functional Requirements

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